The city at the same time in opposite directions left two trains the speed of the first 87 kmch h, the second on 15 km, more what distance will be between them in 4 hours?

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1) 87+15=102km/h the speed of the second 2) 87+102 = 189km/h the general speed 3) 189× 4=756 (km) in 4 hours of 87+15=102 km/h the speed of the second 102+87=189 km/h the speed of a divergence is 189*4=756 km distance between them in 4 hours
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